Don't see the CoD comparisons that have been brought up around the web at all. The game feels like a much improved BioShock, not something else. If I had to point to another shooter, I'd say it follows more in the Halo line of design, with an emphasis on constrained sandbox encounter design within linear level design. It's not open, by any means, but you are given room to experiment within a specific scenario.
Does anyone know if the gear drops are randomized? I'd like to replay again, preferably on 1999 if it actually allows for more than just a cautious crawl, but the same build would end up being optimal if the gear drops are the same. (Although Vigor availability will force it down the same path somewhat anyways.)
Edit: Is Health increased at a higher rate than Shields? I only found enough infusions to max two paths and I went shields > salt.